分会场

第十届内燃机可靠性技术国际研讨会

摘要

As the in-cylinder burst pressure and lift power of diesel engines gradually raise, the thermal loads borne by piston is also increasing. The cooling gallery plays a vital role in piston cooling. However, owing to the complex configuration of the piston head, there are limitations to extend or modifying the volume and the shape of the cooling gallery to improve its heat transfer efficiency. The dimples are casted in cooling gallery may be an effective option. Transplanting the dimples or protrusions in the heat exchanger tubes into the cooling channel may be an effective option. This paper simplifies the cooling gallery to a two-dimensional closed square cavity, and arranges the gallery surface with circular, trapezoidal and rectangular shaped dimples. The numerical simulation method coupled with VOF model and Level-Set model is used to reveal the influence of different shapes of dimples on the gas-liquid two-phase flow and heat transfer ability in the cooling gallery during the reciprocating motion of this piston. At the same time, this paper also established the visualization test bench of oscillatory flow for the research content. The results show that the cooling performance of the local position is significantly improved by the cell structure.

关键词

piston; cooling gallery; dimple; gas-liquid two-phase flow; oscillatory heat transfer

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